Abstract
This article concerns the use of anthocyanin, mallow and their mixture as a low-cost natural dyes to sensitize the photo-anodes of dye sensitized solar cells (DSSCs) based on titanium dioxide (TiO2) layers, and investing their effect on the electrical performance of the realized cells. In fact, different layers of porous titanium dioxide (TiO2) were deposited on fluorine-doped tin oxide glass (FTO) via the electrophoretic deposition (EPD) technique, and then sensitized with natural dyes to form the photo-anode electrode for the DSSC. Four DSSCs are manufactured: three cells, each one is formed by a TiO2 single layer and a cell formed by two TiO2 layers. An electric model, with five parameters based on of the Newton–Raphson algorithm (NR), was used to extract the electrical parameters of the cell and establish a comparative study between simulated and experimental current–voltage characteristic ( J – V ). An improvement of short-circuit current and efficiency was obtained for the DSSC with two layers of TiO2 and sensitized with the mixture of mallow and anthocyanin. Indeed, an increase of short circuit current from 0.34 to 1.98 mA/cm2 was observed and the efficiency reached 0.58%. This increase was more confirmed by external quantum efficiency (EQE). Nevertheless, after 96 hours under standard lighting at room temperature of 25 °C, a degradation of the efficiency of the cell with a rate value of 24% was noted.
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